package com.example.csdn.view.Text;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RoundRectShape;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewParent;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.TabWidget;
import android.widget.TextView;

public class BadgeView extends TextView {
 public static final int POSITION_TOP_LEFT = 1;
 public static final int POSITION_TOP_RIGHT = 2;
 public static final int POSITION_BOTTOM_LEFT = 3;
 public static final int POSITION_BOTTOM_RIGHT = 4;
 
 private static final int DEFAULT_MARGIN_DIP = 5;
 private static final int DEFAULT_LR_PADDING_DIP = 5;
 private static final int DEFAULT_CORNER_RADIUS_DIP = 8;
 private static final int DEFAULT_POSITION = POSITION_TOP_RIGHT;
 private static final int DEFAULT_BADGE_COLOR = Color.RED;
 private static final int DEFAULT_TEXT_COLOR = Color.WHITE;
 
 private static Animation fadeIn;
 private static Animation fadeOut;
 
 private Context context;
 private View target;
 
 private int badgePosition;
 private int badgeMargin;
 private int badgeColor;
 
 private boolean isShown;
 
 private ShapeDrawable badgeBg;
 
 private int targetTabIndex;
 
 public BadgeView(Context context) {
  this(context, (AttributeSet) null, android.R.attr.textViewStyle);
 }
 
 public BadgeView(Context context, AttributeSet attrs) {
   this(context, attrs, android.R.attr.textViewStyle);
 }
 
 
 public BadgeView(Context context, View target) {
   this(context, null, android.R.attr.textViewStyle, target, 0);
 }
 
 
 public BadgeView(Context context, TabWidget target, int index) {
  this(context, null, android.R.attr.textViewStyle, target, index);
 }
 
 public BadgeView(Context context, AttributeSet attrs, int defStyle) {
  this(context, attrs, defStyle, null, 0);
 }
 
 public BadgeView(Context context, AttributeSet attrs, int defStyle, View target, int tabIndex) {
  super(context, attrs, defStyle);
  init(context, target, tabIndex);
 }
 private void init(Context context, View target, int tabIndex) {
  
  this.context = context;
  this.target = target;
  this.targetTabIndex = tabIndex;
  
  // apply defaults
  badgePosition = DEFAULT_POSITION;
  badgeMargin = dipToPixels(DEFAULT_MARGIN_DIP);
  badgeColor = DEFAULT_BADGE_COLOR;
  
  setTypeface(Typeface.DEFAULT_BOLD);
  int paddingPixels = dipToPixels(DEFAULT_LR_PADDING_DIP);
  setPadding(paddingPixels, 0, paddingPixels, 0);
  setTextColor(DEFAULT_TEXT_COLOR);
  
  fadeIn = new AlphaAnimation(0, 1);
  fadeIn.setInterpolator(new DecelerateInterpolator());
  fadeIn.setDuration(200);
  fadeOut = new AlphaAnimation(1, 0);
  fadeOut.setInterpolator(new AccelerateInterpolator());
  fadeOut.setDuration(200);
  
  isShown = false;
  
  if (this.target != null) {
   applyTo(this.target);
  } else {
   show();
  }
  
 }
 private void applyTo(View target) {
  
  LayoutParams lp = target.getLayoutParams();
  ViewParent parent = target.getParent();
  FrameLayout container = new FrameLayout(context);
  
  if (target instanceof TabWidget) {
   
   // set target to the relevant tab child container
   target = ((TabWidget) target).getChildTabViewAt(targetTabIndex);
   this.target = target;
   
   ((ViewGroup) target).addView(container,
     new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
   
   this.setVisibility(View.GONE);
   container.addView(this);
   
  } else {
   
   // TODO verify that parent is indeed a ViewGroup
   ViewGroup group = (ViewGroup) parent;
   int index = group.indexOfChild(target);
   
   group.removeView(target);
   group.addView(container, index, lp);
   
   container.addView(target);
 
   this.setVisibility(View.GONE);
   container.addView(this);
   
   group.invalidate();
   
  }
  
 }
 
 
 public void show() {
  show(false, null);
 }
 
 
 public void show(boolean animate) {
  show(animate, fadeIn);
 }
 
 
 public void show(Animation anim) {
  show(true, anim);
 }
 
 
 public void hide() {
  hide(false, null);
 }
 
 
 public void hide(boolean animate) {
  hide(animate, fadeOut);
 }
 
 
 public void hide(Animation anim) {
  hide(true, anim);
 }
 
 
 public void toggle() {
  toggle(false, null, null);
 }
 
 
 public void toggle(boolean animate) {
  toggle(animate, fadeIn, fadeOut);
 }
 
 
 public void toggle(Animation animIn, Animation animOut) {
  toggle(true, animIn, animOut);
 }
 
 private void show(boolean animate, Animation anim) {
  if (getBackground() == null) {
   if (badgeBg == null) {
    badgeBg = getDefaultBackground();
   }
   setBackgroundDrawable(badgeBg);
  }
  applyLayoutParams();
  
  if (animate) {
   this.startAnimation(anim);
  }
  this.setVisibility(View.VISIBLE);
  isShown = true;
 }
 
 private void hide(boolean animate, Animation anim) {
  this.setVisibility(View.GONE);
  if (animate) {
   this.startAnimation(anim);
  }
  isShown = false;
 }
 
 private void toggle(boolean animate, Animation animIn, Animation animOut) {
  if (isShown) {
   hide(animate && (animOut != null), animOut); 
  } else {
   show(animate && (animIn != null), animIn);
  }
 }
 
 
 public int increment(int offset) {
  CharSequence txt = getText();
  int i;
  if (txt != null) {
   try {
    i = Integer.parseInt(txt.toString());
   } catch (NumberFormatException e) {
    i = 0;
   }
  } else {
   i = 0;
  }
  i = i + offset;
  setText(String.valueOf(i));
  return i;
 }
 
 
 public int decrement(int offset) {
  return increment(-offset);
 }
 
 private ShapeDrawable getDefaultBackground() {
  
  int r = dipToPixels(DEFAULT_CORNER_RADIUS_DIP);
  float[] outerR = new float[] {r, r, r, r, r, r, r, r};
       
  RoundRectShape rr = new RoundRectShape(outerR, null, null);
  ShapeDrawable drawable = new ShapeDrawable(rr);
  drawable.getPaint().setColor(badgeColor);
  
  return drawable;
  
 }
 
 private void applyLayoutParams() {
  
  FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
  
  switch (badgePosition) {
  case POSITION_TOP_LEFT:
   lp.gravity = Gravity.LEFT | Gravity.TOP;
   lp.setMargins(badgeMargin, badgeMargin, 0, 0);
   break;
  case POSITION_TOP_RIGHT:
   lp.gravity = Gravity.RIGHT | Gravity.TOP;
   lp.setMargins(0, badgeMargin, badgeMargin, 0);
   break;
  case POSITION_BOTTOM_LEFT:
   lp.gravity = Gravity.LEFT | Gravity.BOTTOM;
   lp.setMargins(badgeMargin, 0, 0, badgeMargin);
   break;
  case POSITION_BOTTOM_RIGHT:
   lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;
   lp.setMargins(0, 0, badgeMargin, badgeMargin);
   break;
  default:
   break;
  }
  
  setLayoutParams(lp);
  
 }
 
 public View getTarget() {
  return target;
 }
 
 @Override
 public boolean isShown() {
  return isShown;
 }
 
 public int getBadgePosition() {
  return badgePosition;
 }
 
 public void setBadgePosition(int layoutPosition) {
  this.badgePosition = layoutPosition;
 }
 
 public int getBadgeMargin() {
  return badgeMargin;
 }
 
 public void setBadgeMargin(int badgeMargin) {
  this.badgeMargin = badgeMargin;
 }
 
 
 public int getBadgeBackgroundColor() {
  return badgeColor;
 }
 
 public void setBadgeBackgroundColor(int badgeColor) {
  this.badgeColor = badgeColor;
  badgeBg = getDefaultBackground();
 }
 
 private int dipToPixels(int dip) {
  Resources r = getResources();
  float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, r.getDisplayMetrics());
  return (int) px;
 }
}